When I faced a similar project, it didn't occur to me to try a vacuum. I simply put my monofilament line thru the drilled hole... fed it down the pipe til it came out the end. THEN, I attached it to the bolt and pulled the bolt back inside the pipe and into position.
This is actually what I did with the second set of pipes I put a lollipop baffle in, but those pipes were a straight shot. I've done this with the pipes in the photo and another set of straight fishtail pipes.
Just goes to show there are more than one way to 'skin a cat'.